And one-third to



E. M. SMITH.

TIME CALCULATING MACHINE.

, APPLICATION FILED 1uLY'14, 19l6.

Patented 1Y[a.y 10,1921.

3,$HEET SSHEET 1.

5" 311 FIG. 1. H 32, X 36 y lIV l/ENTOR A TTOR/VEV 1 E. M. SMITH. TlMECALCULATING MACHINE; APPLIQAIION FILED JULY 14, 19 16.

Patented May 10,1921.

3 SHEETS-SHEET 2.

ATTORNEY E. M. SMITH.

TIME CALCULATING MACHiNE.

APPLICATION FILED JULY I4 1916.

3 MN 3 .2 m m n N Patented May 10, 1921.

3 SHEETSSHEET 3- UNITED STATES PATENT OFFIfiE.

EDWARD MAYBERRY SMITH, or KANSAS or KANSAS CITY, MISSOURI, Ann ONE-THIRDT0 T0 BETTIE \VADDELL SMITH,

CITY, MISSOURI, ASSIGNOR OF ONE-THIRD ROBERT EMMART SMITH, OF ST. LOUIS,MISSOURI.

TIME-CALCULATING MACHINE.

Specification of Letters Patent. Patented Flay 1Q, 1921.

Application filed July 14,1916. Serial No. 109,400.

To all whom it may concern Be it known that I, EDWARD MAYBERRY SMITH, acitizen of the United States, residing at Kansas City, in the countyofJackson and State of Missouri,- have invented certain new and usefulImprovements in Time-Calculating Machines, of which the following is afull, clear, and exact description, such as will enable others skilledin the art to which it appertains to make and use the same.

The invention relates machines for computing interest and seeks toprovide a simple and efiicient form of machine that willmechanicallyindicate the time in days intervening between the initial and terminaldates of bonds, notes, accounts and the like upon which it is desired toascertain the amount of interest.

The present invention seeks to provide an improved machine that willindicate the number of days from an initial to a terminal date inclusivefor any given time and also indicate the initial from the terminal datewhen the number of days are known, and the terminal date from theinitial date. With these and other objects inview the invention consistsin the features of construc tion, parts, combinations, manipulations,and arrangements of parts hereinafter set forth and more particularlypointed out in the appended claims, the accompanying drawingsillustrating an application of the invention.

In the drawings Figure 1 is a view of the interest calculating machinefrom the usual operating position of the operator with the multiplyingand dividing machine inclosed and not in operative position.

Fig. 2 is an end view of the interest calculating machine closed as inFig. 1.

Fig. 3 is a sectional view of the machine closed, taken on line 3-3 ofFig. 1.

Fig. 4 is an end view of the machine with the multiplying and dividingmachine in operative position.

Figs. 5 and 6 are fragmentary views taken on line 56 of Fig. 3.

Figs. 7 and 8 are fragmentary views of the interest calculating machine,the views extending from opposite ends to and past the center of themachine and overlapping, the

to time calculating column of each view over Fig. 7 being the same.

The lnclosmg casingcomprises upper wall -17, lower wall 18, rear wall19, front wall 20,

intermediate wall 21, end walls 22 and 23, V

and doors 24, the doors being hinged by hinges 25 tothe respective endwalls.

The front wall 20 is curved at 26 and eX- tends horizontally to 27 whereit meets the upper wall 17, the front wall being provided with the slotor elongated opening 28, while the upper wall curves from 27 to 29 andthe greater portion of this distance the wall is divided into bars 30forming the openings 31 therebetween, the bars being provided with thenumerals one to three hundred and ninety inclusive and representing thenumber of days reckoning from the opening 32 as the initial day, thedates appearing in the openings 31 explained.

The elongated opening 28 is for the purpose of reading certain data andformulator tables that can be successively or alternately displayedtherethrough but not claimed in the present application The roller 33 isprovided with the journals 34 and 35 rigid therewith which are journaledin the end walls 22 and 23 respectively, the knob 36 being rigid withthe roller and journaled end thereof 34.

Projecting from the roller 33 and rigid therewith is the brake ring 38which is held 111 contact with the end wall 22 by the compression spring39, the latter bearing against the shoulder 40 of the roller and againstthe end wall 23, the brake ring being suificient to prevent the rollerfrom turning excepting when the knob 36 is pressed toward the end wall22 and the ring released therefrom.

The roller 4]. is ournaled on the shaft 42, the latter having a squareend 43 fitting in the end wall 22 to prevent the shaft from turning, theopposite end of the shaft fitting the end wall 23.

Secured to theshaft 42 at 44 and to the roller at 45 is the windingSpring 46 which will allow the roller to turn several revolutions, thespring always exerting a force to return the roller to normal position.

The time computing sheet 47 is secured to the roller 33 and the roller41 so that it can be rol ed f m 0. to the other and return,

the object being to roll the sheet to and fro to place the desired dateson the sheet in alinement with the numerals on the bars 30 so that thenumeral on the bar adjacent the desired date and on the right handthereof can be noted. It is understood that by pressing the knob 36toward the wall 22, the roller 33 can be turned in either direction andthe time computing sheet 47 wound on the roller 33 and unwound from theroller 11, the spring 46 operating to rewind the sheet on the roller 41as it is unwound from the roller 33, so that any date on the computingsheet can be displayed in the openings 31, with the desired datesthereon in ilinement with certain numerals on the bars 80.

The machine 61 1s of the usual type for multiply ng, dividing,subtracting, and

adding, and is employed principally for multiplying and dividing asthese are the only computations necessary to determine all the usualamounts of interest.

' To calculate the interest for a given time on a given amount, theinitial date on the time comoutin sheet 17 is alaced in the pening 32,the date appearing in this position of the drawing in Fig. 7 being Dec.31, 1915, the terminal date is then noted and the numerals to the rightthereof and in alinement therewith on the adjacent bar 30 is read, thislast number being the number of days from the initial to the terminaldate inclusive.

It will be noticedthat each bar 30 contains thirty numbers so thatperious of thirty, sixty, and ninety days and other multiples of thirtywillread in alinement with the initial date in the opening 32, thisbeing very advantageous as most interest dealt with in banks and thelike runs thirty days or in multiples of thirty days.

. Should the date of maturity be known the number of days is instantlyfound by glancing to the right and noticing the position of the maturingdate, the number of days on the bar 30 to the right of the maturing dateand in alinement therewith always representing the number of days forwhich the interest is to be computed.

Should the interest desired be for a period of one year from date, thedate Dec. 31,,

1916, will be found in the column over the numerals 13 and the'days willbe 366 as indicated. i

- Interest is usually figured for a period of one year from' date, onemonth or a given number of months, a given number of months and days, agiven number of days, to a specified date after the initial date, or ondemand, the time calculating sheet serving equally well and instantlyindicating the number of days in each and What I claim is In a timecalculating machine for computing interest, a series of columns ofdates, each of said dates naming a month, a day 01" the month and acertain year, numerals running successively from 1 to 390, inclusive,and arranged parallel with said columns of dates with thirty of thenumbers indicated by said numerals to each column of said dates, andmeans to display said dates so that said numerals, counting from and notincluding the initial date, will instantly and simultaneously indicatethe day the month and the year of terminal dates of thirty days, sixtydays, and ninety days following the initial date, and multiples ofthirty days, sixty days, and ninety days from and after the initial dateand simultaneously indicate any and all terminal dates including theyear from and after the initial date to and including three hundred andninety days from the initial date.

In testimony whereof I alfiX my signature in the presence of twowitnesses.

EDWARD MAYBERRY SMITH.

Vitnesses:

LYNN IlARnIsoN, FLOYD S. STRATTAN.

every condition.

